Apple Power Macintosh Dual G5 2.3 GHz (Dual Core) 2005-10

Memory Upgrades
The Apple Power Macintosh G5 2.3 MHz (Dual Core) model
has 512 MB of standard memory installed on the system board; the system
has eight memory expansion slots for main memory expansion. The system
RAM can be expanded up to 16384 MB (Megabyte) or 16 GB (Gigabyte) maximum.Memory modules must be added in pairs.